You :
You should be seen by your doctor and have an ultrasound. An ultrasound is the best way typically to determine if a woman has ovarian cysts. Also if there is any chance you could be pregnant then please take a test. If you have worse pain, think you are pregnant, or have vomiting or fever then you should be seen as an emergency.
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A cyst is a structure or mass that consists of a cellular lined sac. It is typically filled with fluid but may be filled with solid material. It can be congenital, traumatic, or acquired. They may develop nearly anywhere in the body and usually require complete excision for eradication or they are likely to recur. Fluid filled sacs that are not cellular lined may be called pseudo-cysts.
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3

Yes.:
Ovarian cysts do vary in size quite alot. In your age group, a small cyst is about 2-3 cm. I've seen cyst as large as 10 cm or more. Cyst less than 2.5 cm are probably functional follicle in your age group. A cyst may grow or persist over a few menstrual cycle or complete resolve.
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4

See below.:
Many ovarian cysts resolve on their own. Your doctor may consider watchful waiting to see if this would happen. Some cyst such as dermoid cyst, cystadenoma or endometriom don't go away on their own but these are rare compared to the typically follicular cysts.
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7

Yes, unlikely:
A cyst that has contents that will cause severe inflammation (peritonitis), a cyst that twists, cuts off its blood supply and causes gangrene, and a cyst that ruptures and causes interrnal hemorrhage could possibly cause death. All are not likely scenarios. Most ovarian cysts resolve without any treatment. Oftentimes, they not even known by the woman to be present before they resolve.
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12

Several weeks.:
Most ovarian cysts are functional, that is they are normal cysts that get bigger than they should. These will mostly resolve on their own in several weeks to several months and only occasionally require surgery. Birth control pills can make them resolve faster. A few cysts are a benign growth. This type doesn't not get smaller over time and typically requires surgery to remove the cyst.
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